Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

They are incredibly aggressive, territorial, and solitary predators. They will not hesitate to bite the hand that feeds them, so extreme caution is required during tank maintenance. Despite their fearsome reputation, they can be skittish and require a dark, quiet environment to feel secure.

Diet

Omnivore

They are formidable predators that require a diet of meaty foods. Offer them fish fillets, shrimp, earthworms, and occasionally appropriately sized live foods if legally permitted and quarantined. Avoid mammalian or avian meats as the lipids cannot be properly digested.

Sex ratio

Solitary

Because they must be housed alone, sex ratio is irrelevant for the home aquarist. Sexing them visually is nearly impossible without observing breeding behaviors in the wild. You should only ever keep one individual per tank.

Feeding frequency

Twice daily

Juveniles should be fed once a day to support their growth. Adults can be fed a large meal once every few days, replicating their feeding habits in the wild. Remove any uneaten food immediately to prevent severe water quality degradation.

Bioload

The Black Piranha produces a very heavy bioload due to its large size and predatory diet. They generate substantial amounts of waste after processing large, protein-rich meals. Over-filtration and frequent, large water changes are essential to maintain safe water parameters.

Flow

Stagnant

They prefer moderate water flow that provides excellent oxygenation. They originate from various river environments in the Amazon basin, many of which have steady currents. Providing a powerhead can encourage them to swim and stay active.

Reproduction

Oviparous

Breeding this species in captivity is virtually unheard of due to their extreme solitary aggression. In the wild, they reproduce during the wet season among flooded vegetation. Attempting to pair them in home aquariums almost always results in the death of one fish.

Compatibility & tankmates

They are highly aggressive and absolutely intolerant of tank mates. Even fish larger than themselves or thick-scaled armored catfish will eventually be attacked or killed. They must be kept strictly as solitary specimens in a species-only aquarium.

Tank level

Middle

They are mid-water swimmers that will utilize the entire aquarium space. They prefer having some cover, such as large driftwood pieces, to retreat behind. Ensure there is ample open swimming room for them to patrol their territory.